Provisioning
150-359-100-01,
Revision
01
14
October 27, 2000
HXU-359 List 1
S
ETTING
THE
S
YSTEM
C
LOCK
S
YNCHRONIZATION
Synchronous network elements must derive their timing from a reference
source. Each HXU-359 can be synchronized with the following timing
sources:
•
the internal clock, which is set at 51.84 MHz ±20 ppm
•
the received SONET STS-1 signal
•
any external DS1 input
•
either of two BITS inputs
The HXU uses the primary source during normal operation and, if a problem
is detected in the primary signal, the system automatically switches to the
secondary source. If a problem is detected in the secondary source, the signal
switches to the internal clock. A failure in the clock reference generates a
major alarm.
Figure 10.
Clock Configuration
